3051壓(ya)力變(bian)(bian)送(song)器我們可以理解為(wei)一種系列。自(zi)2051壓(ya)力變(bian)(bian)送(song)器被取(qu)代之(zhi)后，3051便(bian)成為(wei)了(le)變(bian)(bian)送(song)器使(shi)得(de)行(xing)業中得(de)應的系列變(bian)(bian)送(song)器。3051同時(shi)也繼承了(le)2051系列變(bian)(bian)送(song)器的所(suo)有特(te)點。一概既往的使(shi)用HART通信協(xie)議。 3051壓(ya)(ya)(ya)(ya)(ya)力(li)變(bian)送(song)(song)(song)器工作(zuo)時，高、低壓(ya)(ya)(ya)(ya)(ya)側的(de)(de)(de)隔離膜片(pian)(pian)和(he)(he)灌充液(ye)將過(guo)程壓(ya)(ya)(ya)(ya)(ya)力(li)傳(chuan)(chuan)遞(di)給灌充液(ye)，接著灌充液(ye)將壓(ya)(ya)(ya)(ya)(ya)力(li)傳(chuan)(chuan)遞(di)到傳(chuan)(chuan)感(gan)(gan)器中心的(de)(de)(de)傳(chuan)(chuan)感(gan)(gan)膜片(pian)(pian)上。傳(chuan)(chuan)感(gan)(gan)膜片(pian)(pian)是(shi)一(yi)個張緊(jin)的(de)(de)(de)彈性元件，其位移隨所受壓(ya)(ya)(ya)(ya)(ya)而變(bian)化（對于(yu)GP表壓(ya)(ya)(ya)(ya)(ya)變(bian)送(song)(song)(song)器，大(da)氣(qi)壓(ya)(ya)(ya)(ya)(ya)如同(tong)施加在傳(chuan)(chuan)感(gan)(gan)膜片(pian)(pian)的(de)(de)(de)低壓(ya)(ya)(ya)(ya)(ya)側一(yi)樣(yang)）。AP絕壓(ya)(ya)(ya)(ya)(ya)變(bian)送(song)(song)(song)器，低壓(ya)(ya)(ya)(ya)(ya)側始終(zhong)保持(chi)一(yi)個參考壓(ya)(ya)(ya)(ya)(ya)力(li)。傳(chuan)(chuan)感(gan)(gan)膜片(pian)(pian)的(de)(de)(de)大(da)位移量為(wei)0.004英寸（0.1毫(hao)米），且位移量與(yu)壓(ya)(ya)(ya)(ya)(ya)力(li)成正比。兩側的(de)(de)(de)電(dian)容極板(ban)檢測(ce)傳(chuan)(chuan)感(gan)(gan)膜片(pian)(pian)的(de)(de)(de)位置(zhi)。傳(chuan)(chuan)感(gan)(gan)膜片(pian)(pian)和(he)(he)電(dian)容極板(ban)之間(jian)電(dian)容的(de)(de)(de)差值(zhi)被轉(zhuan)換(huan)為(wei)相應的(de)(de)(de)電(dian)流(liu)，電(dian)壓(ya)(ya)(ya)(ya)(ya)或數字HART（高速(su)可(ke)尋址(zhi)遠程發送(song)(song)(song)器數據(ju)公路）輸出(chu)信號。
根據不同工況的(de)要(yao)求，在安(an)裝方(fang)式和(he)介質上也(ye)是需要(yao)非常注意的(de)。不正確的(de)安(an)裝方(fang)式往往是導(dao)致(zhi)壓力變(bian)送器(qi)精度(du)下降的(de)主(zhu)要(yao)原因。分(fen)為共平面(mian)和(he)管(guan)理直接安(an)裝式。
一、液(ye)體的應用
1、將分(fen)流接頭安裝在管道側面；
2、將變送器安(an)裝(zhuang)在分流(liu)接頭的側面或底部；
3、安(an)裝(zhuang)變送器時應使(shi)用排液、排氣閥向上；
二、氣(qi)體的應用
1、將分(fen)流接頭安裝在管道(dao)頂部或側面；
2、將變送器安裝(zhuang)在分流接頭的側面或頂部(bu)；
三(san)、蒸汽的應用
1、將分(fen)流接頭安裝在(zai)管理側面；
2、將變(bian)送器安裝在分流接(jie)頭的側面或底部；
3、將引壓管內(nei)充滿(man)冷卻水。
